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| Patents for William Zittel | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 230,603 | Aug. 03, 1880 | D.F. Barber | Countersink | |
| 291,126 | Jan. 01, 1884 | H.G. Ashton | Safety-Valve | ||
| 301,079 | Jul. 01, 1884 | H.G. Ashton | Safety-Valve | ||
| 303,252 | Aug. 12, 1884 | H.G. Ashton | Safety Valves | ||